feat(backend,frontend): feed gets a bots tab so private is people only, a folder's context menu opens the feed of its chats

frontend/src/lib/api/endpoints.ts

@@ -284,6 +284,7 @@ export interface FeedQuery {
   chat_id?: number;
   chat_kind?: FeedChatKind;
   cursor?: string;
+  folder_id?: number;
   kind?: FeedKind;
   limit?: number;
 }